I got it now. Thanks to Mihai for the thorough explanation.
Encore une fois, merci :)
On Feb 12, 4:58 pm, Mihai DINCA <mihai.di...@free.fr> wrote:
> Hi Michel
>
> The statements :
> -- SomeType[ ] ages = null;
> declares a variables to be used as an array of objects of SomeType.
>
> -- ages = new SomeType[ 3 ];
> creates a three elements array (each element is empty:
> System.out.println(ages[i]) will print "null").
>
> -- for ( int i = 0 ; i < ages.length ; i++ ) ages[i] = new SomeType();
> stores in each element of the array an object of SomeType
>
> Imagine now that SomeType is int[ ]
>
> Then:
> -- int[ ][ ] ages = new int[3][ ];
> declares a variable to be used as an array of three elements,
> each element will be an array of int,
> each element is for the moment null
>
> -- for ( int i = 0 ; i < ages.length ; i++ ) ages[i] = new int[4];
> associates to each element of the array "ages" an array of four
> integers.
>
> The same thing can be written as:
> -- int[ ][ ] ages = new int[3][4];
>
> Now:
> -- ages is an array of three elements, each element being an array of
> four integers
> -- ages is an array of arrays
> -- ages[2] is an array of integers
> -- ages[2][1] is an integer
> -- for ( int i = 0 ; i < ages.length ; i++ ){ // for each of the 3
> arrays in ages
> for ( int j = 0 ; i < ages[i].length ; j++ ) { // for each of
> the 4 integers in the i-th array
> ages[ i ][ j ] = i * j; // The j-th integer in the i-th
> array set to i * j
> }
> }
>
> Hope it helps
>
> Mihai
>
> Le 12/02/2011 15:34, Michel a crit :
>
> > Hello folks,
> > Can someone please help me understand this part of the code from
> > LAB-1036: Exercise 1, part 2?
>
> > // Display the value of each entry in the array
> > for( int i=0; i<ages.length; i++ ){
> > System.out.println("\nStarting row " + i);
> > for( int j=0; j<ages[i].length; j++ ){
> > ages[i][j] = i * j;
> > System.out.print( ages[i][j] + " " );
>
> > When we say ages[i][j] = i * j; does that mean that if for instance
> > i=2 and j=2 then the array will display as number 4 (2*2=4)? I guess
> > what I don't understand is how an array that is represented as rows
> > and columns can equal a number (since i * j is a number)?
>
>
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